S12 / MagniV MicrocontrollersのトピックRe: __restrict keyword for the XGATE compiler https://community.nxp.com/t5/S12-MagniV-Microcontrollers/restrict-keyword-for-the-XGATE-compiler/m-p/182495#M6718 <HTML><HEAD></HEAD><BODY><P>The semantic is the same as the restrict keyword in ANSI C99.</P><P>&nbsp;</P><P>It basically means that the structure pointer to by a restricted pointer is not modified by some other alias.</P><P>More concretely for the RS08, __restrict is used for the pointer to the parameter block for a channel to allow the compiler to keep parameter values in registers even when calling other functions.</P><P>Without restrict, the compiler just knows about a pointer to a struct and would not know that the values in the struct did not change, so he would have to reload them whenever used.</P><P>&nbsp;</P><P>Daniel</P></BODY></HTML> Thu, 11 Mar 2010 23:47:06 GMT CompilerGuru 2010-03-11T23:47:06Z __restrict keyword for the XGATE compiler https://community.nxp.com/t5/S12-MagniV-Microcontrollers/restrict-keyword-for-the-XGATE-compiler/m-p/182494#M6717 <HTML><HEAD></HEAD><BODY><P>Hi</P><P>does anybody know which is the usage of the __restrict keyword for the XGate compiler?</P><P>Many thanks</P><P>Davide</P></BODY></HTML> Thu, 11 Mar 2010 21:10:05 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/restrict-keyword-for-the-XGATE-compiler/m-p/182494#M6717 davide_ferrari 2010-03-11T21:10:05Z Re: __restrict keyword for the XGATE compiler https://community.nxp.com/t5/S12-MagniV-Microcontrollers/restrict-keyword-for-the-XGATE-compiler/m-p/182495#M6718 <HTML><HEAD></HEAD><BODY><P>The semantic is the same as the restrict keyword in ANSI C99.</P><P>&nbsp;</P><P>It basically means that the structure pointer to by a restricted pointer is not modified by some other alias.</P><P>More concretely for the RS08, __restrict is used for the pointer to the parameter block for a channel to allow the compiler to keep parameter values in registers even when calling other functions.</P><P>Without restrict, the compiler just knows about a pointer to a struct and would not know that the values in the struct did not change, so he would have to reload them whenever used.</P><P>&nbsp;</P><P>Daniel</P></BODY></HTML> Thu, 11 Mar 2010 23:47:06 GMT https://community.nxp.com/t5/S12-MagniV-Microcontrollers/restrict-keyword-for-the-XGATE-compiler/m-p/182495#M6718 CompilerGuru 2010-03-11T23:47:06Z